A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will

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Question:A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will

1.become zero

2.become infinite

3.become small, but non-zero

4.remain unchanged

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  1. A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
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